What type of vessel is referred to as a SUB Tender?

The vessel referred to as a SUB Tender is classified as an AS, or Submarine Tender. Submarine tenders are specialized support ships designed to provide logistical, maintenance, and repair support to submarines while they are in port or at sea. These vessels are equipped with facilities and personnel to handle repairs, supplies, and any other necessities that submarines may require, thereby allowing submarines to remain operational for extended periods.

In a fleet context, having a dedicated submarine tender ensures that these critical assets can be efficiently serviced and maintained, which is vital for maintaining a strong naval presence. The role of the submarine tender is essential for operational readiness and logistical support for undersea operations. Other types of vessels, while also important, serve different functions within the navy's mission and do not provide the specialized support that submarines require.